Yes you need a step down, watch the BOM. Connect the Step down to 24V, adjust the Output to the needed Voltage. At the Output Side, connect +12 V to the Fan, ground of the Fan to your Board MOSFET D09 ground...PWM works great

I almost finished, all axis moves and heat the hotend and bed, but can't make home, is like there are no sensors, I connect the hall effect sensors to X-,Y- and Z-, polarity and signal doble checked, but go to the end and try to continue! don't stop...

Hi, I love my Tantillus R and now I plan to install a raspberry pi zero w to control the printer, the frame have a holes to it but, how to wire to the MKS? is over USB? the usb is outside the printer and the raspberry is inside...

But a warning:
The Zero is not able to operate the TR via Octoprint. Because of its really suboptimal programming, Octoprint needs a bigger Pi.
It may work with Repetier Server, which is much more efficiently encoded.

Awesome machine! I love it. I'm currently rebuilding an original Prusa i3 MK2.5S with partially original and partially homebrew parts and rebuilding a cheap Delta with again completely random parts and an SKR v1.3.. If these projects fail I will make this Tantillus since I just started working in a maker-workshop on my old art academy and suddenly have free unlimited access to a huge CNC mill, a CO2 laser cutter and a whole room filled with 3D printers 'hehe'.